Copper alloy.



UNITED. STATES PATENT OFFICE.

' GUSTAV CHAUDOIR, JR., OF VIENNA, AUSTRIA-HUNGARY.

COPPER ALLOY.

Specification of Letters Patent.

Patented May 22, 1906.

Application filed February 3, 1904. Serial No. 191 911.

To all whom it may concern:

Beit known that LGus'rAv CHAUDOIR,JI1I1., a subject of the King of Belgium, residing at Vienna, in theProv'ince of Lower Austria and Empire of Austria-Hungary, have invented certain new and useful Improvements in Copper Alloys, of which the following is a specification. I

My invention relates to alloys of cadmium with copper and the ordinary alloys of copperviz., bronze and brass.

It is a Well-known fact that the tensile strength of copper and its ductibility decrease rapidly when the temperature of the metal is raised. Tests carried out on a testing-ma chine, admitting of the metal being heated to any desired" temperature, have shown that copper which at the temperature of 15 centigrade has a tensile strength of 38.1 kilograms per square millimeter has only a tensile strength of 15.3 kilograms per square millimeter at a temperature of 500 Centigrade.

Now my invention has for its object to effect an increase in the tensile strength and ductibility of copper and of its common alloys (bronze and brass) at high temperatures.

By conducting a series of experiments I have found that the purpose 'in view is advantageously attained by alloying copper, bronze, and brass with cadmiumin certain proportions.

I am aware that the specification of British Patent No. 10,197 of 1897 indicates alloys I of copper which besides other metals contain at most 0.5 per cent. of cadmium, thesaid I alloys being utilized in the manufacture of dynamo-brushes and their special composition having the eficct of lessening the friction between the brushes and collectors or commutators. ,However, the alloys referred to are on account of their too low percentage of cadmium quite unfit for the attainment of the purpose in View.

According to my invention from threefourths to three and one-half per cent. of cadmium are added to the copper and to its common alloys, (bronze and brass.) By this addition .the tensile strength of copper at the temperature of 500 centigrade is increased to 30.3 kilograms per square millimeter. The increase of the ductibility is especially conspicuous in the alloys richer in cadmium.

An alloy containing ninety-two parts of copper, four and one-half parts of tin, and three and one-half parts of cadmium has shown especially good results.

What I claim, and desire to secure by Letters Patent of the United States, is

A copper alloy containin from threefourths to three and one-hal parts of cadmium per from ninety-nine and one-fourth to ninety-two parts of cop er.

In testimony whereo I have signed my name to this specification in the presence of two subscribing witnesses.

GUSTAV CHAUDOIR, J R. 

